itextsharp.dll tableCell.Text gets empty "" in gridview

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C#

ASP.NET

hi,
i am using wijmo gridview which is third part tool. i need to convert gridview to pdf.
asp.net gridview works well with itextsharp.dll and converts gridveiw to pdf file.
But wijmo gridview reads emtpy "" in text..

PdfPTable pdfTable = new PdfPTable(grdweballorders.HeaderRow.Cells.Count); //created pdftable

foreach (C1GridViewRow c1gridviewrow in grdweballorders.Rows) //loop through each row
{
    foreach (TableCell tableCell in c1gridviewrow.Cells) //loop through each cell
    {
        PdfPCell pdfcell = new PdfPCell(new Phrase(tableCell.Text));  // Here i am getting "" (emtpy in tableCell.Text when i use wijmo gridview. but if i use asp.net grid view, i am getting                                                                                                                              cell value)
        pdfTable.AddCell(pdfcell);
    }
}